Sweet Potato-Raisin Bread Squares - California Raisins

Ingredients

• 1 / 2 No.10 can canned sweet potatoes, drained
• 6 1 / 4 Cups all-purpose flour
• 2 1 / 2 Cups sugar
• 1 / 4 Cup instant nonfat dry milk*
• 2 Tablespoons baking powder
• 1 Teaspoon baking soda
• 1 Teaspoon salt
• 1 Teaspoon ground allspice
• 1 Teaspoon ground nutmeg
• 1 Teaspoon ground cloves
• 4 whole eggs
• 1 1 / 4 Cups water
• 1 Cup shortening
• 3 / 4 Cup California raisins
• 1 1 / 2 Cups chopped walnuts